could u pease help me out ASAP

1. a) List five main additives used to thin water-based drilling muds. [5 marks] b) State five main rheological models used for drilling fluids. [5 marks] c) It is intended to dilute 50bbl mud from 13 ppg to a heavy mud with the density of 7 ppg (i) Identify with reason, the optimum diluting agent. [3 marks] (ii) Compute the final mud volume (in barrels) and the mass of required material (in pounds)